realtime uv unwrapping from view with moving or rotating of unwrapped mesh
The Texture Coordinate could interest you:

If you use its Camera output socket, it will project your image on the object surface, but the image will always face the view:



If you use the Object output socket, you can choose an Object on the bottom of the node, here an empty, and the image location will depend on the location of your empty, not the location of your object, if you move your object, the image won't follow, if you move your empty, the image will follow: